TU1032 - User Instructions for GenII TMET weather transmitter

The TMET is part of the Eltek GenII family of transmitters.

The TMET transmitter is designed to be used with the Vaisala weather monitor or ultrasonic wind sensor and pyranometer. It provides comprehensive local weather channels at the receiver/logger (referred to hereafter as RX250AL).

TMET accessories include an outdoor pole mounting enclosure, pole mounting solar panel or AC power supply and additional air temperature sensor.

The TMET provides inputs for:

1 x RS232 plus power for the Vaisala WXT520 weather sensor or WMT52 ultrasonic wind sensor

1 x 0-50mV range with scaling for use with Kipp and Zonen CMP3 pyranometer or Skye Instruments SKS1110 pyranometer.

1 x Thermistor temperature input for use with a ground temp or radiant air temp sensor.

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TMET channel assignment:

Channels can be presented at the RX250AL together with those from any other GenII transmitter and can be reordered during TX Set-up or when configuring the RX250AL. Channels can only be renamed when configuring the RX250AL with Darca software. Note: RX250AL channels are numbers 1 through 247. TMET channels are labelled A through H.

TMET Channel

Vaisala WXT520 connected Vaisala WMT52 connected

Range

A Wind direction Wind direction 0°- 360°

B Wind speed Wind speed 0-60m/s

C Rainfall N/Asee Page 8 0.0 to 6500.0mm

D Temperature N/A -52.0 to 60.0°C

E Relative humidity N/A 0 to 100%

F Barometric pressure N/A 600 to 1100hPa

G Thermistor temperature probe -50.0 to 150.0°C

H If Kipp & Zonen CMP3 connected, range is typically 0-5000w/m2 and is a function of CMP3 calibration value.

If Skye SKS1110 connected range is 0-5000w/m2

See page 5 “setting up channel H”

Note: Channels C to H are the instantaneous sensor values at the time of transmission.Channels A and B are averaged values at the point of transmission, see Vaisala Notes P8

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Sensors that can be used with TMET

Vaisala WXT520: For operation and mounting, refer to the User Guide supplied with the product. Ensure the WXT520 is pointing north (refer to N← moulded into base - see P147).

WXT520 supplied by Eltek is preconfigured and includes a 26.7mm or 30mm diameter pole top adaptor (see P148) and 3M connecting lead. TMET powers the WXT520.Note: TMET cannot provide wind gust data

Vaisala WMT52: For operation and mounting, refer to the User Guide supplied with the product. Ensure the WMT52 is pointing north (refer to N← moulded into base).

WMT52 supplied by Eltek is preconfigured and includes a 26.7mm or 30mm diameter pole top adaptor and 3m connecting lead. TMET powers the WMT52.Note: TMET cannot provide wind gust data

Kipp and Zonen CMP3: Refer to the instruction sheet for correct orientation and to the calibration certificate for SENSITIVITY value, which will be required when setting the H channel range. A mounting bracket/base may be required. (e.g PyroBkt below). CMP3 does not require power.Note: TMET cannot provide sunshine hours.

Skye SKS1110: Refer to manual and product specification. SKM221 levelling unit and SKM226 mounting bracket may be required. SKS1110 does not require power.Note: TMET cannot provide sunshine hours

PyroBkt: This is a pole mount robust bracket pre-drilled for use with the Kipp and Zonen CMP3 and the SKS1110.The mounting bracket positions the centre of the CMP3 approximately 155mm from the mounting pole. A stainless steel U bracket with securing nuts is included. Ensure that the CMP3 sensor is not in the path of the shadow cast by the pole.

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Ground temperature probe: Eltek supplied thermistor probes with U type sensors are rated +/-0.1°C for 0 to 70°C. See the Eltek website for probe specification and cable styles.

Radiant air temperature probe: Grant Instruments type AG. Refer to the Eltek website for additional information.

WBT Outdoor 25mm dia pole mounting enclosure, 200 x 300 x 132mmWeight (excludes TMET): TBAWBT is supplied with 2 x 12mm and 2 x 16mm compression glands at the base of the enclosure for external antenna, solar panel or 12VDC power, pyranometer or temperature probe cable access.

SPTMET(if using any other panel ensure max charge current is <1A to prevent failure of FU2)

10W solar panel supplied with 25mm dia pole mounting bracket and lead. Charge rate is 1A max.For northern hemisphere locations the SPTMET should be facing due south. The bracket fitted provides fixed inclination of 30 degrees and is optimised for latitude 52 degrees north. For extremes of latitude an alternative bracket may be required.

MP12U/TMET 100/250AC to 12VDC power supply. This is the standard MP12U re-terminated with bare ends. The +/positive lead is indicated by a red sleeve.

Accessories for TMET

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Battery connector.

Observe polarity!

Lead to “comms” socket

1 of 4 fixing holes.

Fuse FU1, 1A(12VDC input protection)

Fuse FU2, 1A(solar input protection)

Sma Antenna socket.Use only antenna marked “TMET”!

D5 - LED

D9 - LED

concealedpush button

switch

Location of key components (panel removed):

7.2VDC NiMh battery with built in temperature sensor.

7-12VDC

RX TX

Inner

Screen

WXT520 Pyro TempSolarpanel

0 0 00

antennaWMT52

++++

TMET Connections

Comms socket

Connections strip

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Battery header

Ensure Comms head connection is secured

black

redbrown

black

bluegreen

Powering the TMETTMET is supplied with a 2Ah NiMh battery partially charged and disconnected. TMET can be charged from a solar panel, Eltek type SPTMET or external 12VDC supply e.g. Eltek type MP12U. Caution: do not use a panel rated greater than 10W

Charging using SPTMET solar panelConnect solar panel to “Solar panel“ inputs. Observe polarity. Maximum current (1A max) from the solar panel is connected directly to the battery. If the battery pack temperature sensor exceeds 50°C a charge current limiter prevents overheating of the battery. Reversing the solar panel connections could cause fuse FU2 to fail.

Charging using the MP12U Connect MP12U to 7-12VDC inputs. Observe polarity. The input is reverse polarity protected; refer to protection fuse FU1. D9 will illuminate. With MP12U connected the fast charge rate is approx. 350mA. Battery temperature detection at 50°C will cause charging current to reduce. Fast charge is reduced if the DC voltage is less than 12VDC.

Battery The battery should be disconnected if the TMET is to be stored or not used for more than 5 days. This is to prevent deep discharge of the battery which can degrade battery capacity and life. To disconnect:" Release the semi captive 4 x screws retaining the clear front cover " Remove the 4 screws retaining information plate " Carefully withdraw battery lead from header (this is the black/brown/red cable form).

To reconnect, reverse disconnect procedure. Ensure the lead is refitted correctly (see P5).

Caution!Do not attempt to connect the solar panel and a 12VDC supply simultaneously as damage to the TMET can result!With a Vaisala sensor connected, battery capacity is rated for 5 days operation (once fully charged) in the event of no charging source – i.e. complete cloud cover or 12VDC failure.

Locating the TMETTMET is rated for indoor use only. If used outdoors, TMET must be housed in a secondary enclosure e.g. outdoor unit type WBT from Eltek. The WBT is for mounting on a 25mm lightweight aluminium pole.

TMET is supplied with a compressed antenna; to extend the range an external antenna can be used e.g a light weight dipole antenna with lead, type LWANT/sma. Alternatively a Yagi antenna, available from other suppliers can be used. Do not exceed 10mW ERP. TMET range can also be extended by using the RP250GD repeater unit.

Refer to the information supplied by Vaisala for siting and mounting the weather/wind monitor sensor. A 25mm pole top bayonet fitment is available from Vaisala.

Be aware that high power transmitters are frequently sited on top of buildings and could interfere with either TMET or Vaisala sensors. As a precaution, site TMET and Vaisala devices clear of such transmitter antennae.

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Indicators and concealed switch (located behind the fascia)Red LED (D9) indicates external DC power is connected to the “7-12VDC” input.Red LED (D5) cadence due to activation of the concealed switch (SW1):

Function Activate switch for

LED cadence LCD

Tx disable 5 seconds 5 x fast flashes After 5 seconds displays OFF

Tx enable 5 seconds 1 continuous 5 sec flash

After 5 seconds displays sensor information

Test transmissions approximately every 5 sec for 2 minutes.

2 seconds Short flash at time of transmission

No change

Red LED (D5) due to TMET being configured or not configured:

TMET condition LED Note LCD

TMET not configured “Blink” every 8 seconds

Battery gauge displayed only

TMET configured Short flash at time of a transmission

A transmission occurs at a random time within the set TX interval

See Display below

LCD The LCD includes a battery condition gauge, active at all times (Battery gauge will flash if battery failure imminent). Only configured channels are displayed. If a channel is configured but not connected to the sensor the LCD shows:

A OPEN E OPEN %

B OPEN F OPEN

C 0.0 G Lo °C

D OPEN °C H Lo

Note: If the TMET is to be stored or will not be connected to a charging source for more than 5 days, it should be disabled (put into hibernate mode) to prevent total battery drain and possible loss of settings. To do this, first remove the clear front cover, and then remove the label panel. Press the concealed switch (SW1) for 5 seconds. The LCD will now read OFF.

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TMET configuration using Darca softwareRefer to the Quick start guide (ref TU1008). This is supplied with the RX250Al or can be downloaded from http://www.eltekdataloggers.co.uk/literature.shtml Connect the LCTX3 to the “Comms” socket. Don't forget to set up the logger interval first!(Note that the TMET cannot be configured by the logger only.)

Before setting Tx channels please set the TX Interval:

Note: Tx channels A to G are pre-set. Select as appropriate, set channel and then meter to check. Do not attempt to set alarms!

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Configuring the Rain parameter in Darca Heritage for Tx Channel C (precipitation)The value of rainfall recorded by the logger is the total measured during each logging interval. It is important to consider the maximum expected value of rain during this time period in order to optimise the range of the rain parameter.In Darca Heritage, open the Parameters window by clicking Site Settings > Parameters.As an example, if the maximum rainfall expected at the location is 5mm during a logging interval of 5 minutes, set the Range of the parameter to:

Setting / scaling Channel H for the Skye SKS1110 Pyranometer" Connect the SKS1110 to the TMET: green to pyro +, red and blue to pyro 0." In Range for channel H, select EU Range from the drop down list. Click Set channel

and then Edit Eu Range (hardware range is 0.00 to 50.00mV).

EU range configuration:" SKS1110 output is 10uV/Wm2

Assuming a typical UK day, clear and sunny equates to a solar radiation value of 1000W/m2 or more. Therefore, an SKS1110 will deliver 10mV at 1000W/m2 (SKS1110 usable to 5000W/m2)TMET range is 0-50mV. Therefore 50mV equates to 5000W/m2In the EU Range Selector: Channel H window (Do not click on Helper!)Set Maximum to 50000Set units to Wm2Set DP Position to 1 then click OK" Now check in Range for channel H that the text reads (EU Range) Voltage (0 to

5000.0Wm2)

Setting / scaling Channel H for the Kipp and Zonen CMP3 pyranometer" Connect the CMP3 to the TMET: red to pyro +, black (screen) and blue to pyro 0." In Range for channel H, select EU Range from the drop down list. Click Set channel

and then Edit Eu Range (hardware range is 0.00 to 50.00mV).

EU range configuration:" Refer to the CMP3 Calibration Certificate for SENSITIVITY value in uV /Wm. Let’s say for

example that the CMP3 output is 10.32uV/Wm2" Assuming a typical UK day, clear and sunny equates to a solar radiation value of

1000W/m2 or more. Therefore, a CMP3 will deliver 10.32mV at 1000W/m2 " TMET range is 0-50mV. Therefore 50mV equates to 5000W/m2" In the EU Range Selector: Channel H window (Do not click on Helper!)" Set Maximum to 48450" Set units to Wm2" Set DP Position to 1 then click OK" Now check in Range for channel H that the text reads (EU Range) Voltage (0 to

4845.0Wm2)

Now Close Transmitter Connections and follow the instructions, ending the routine by clicking Send to Squirrel and then OK, and close the Window.

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TMET specificationFrequency: Default is 434.225Mhz (other frequencies are available)Tx compliance: To EN300 220 -1Tx output power: 10mW ERPUseable Tx interval: typically 10 seconds to 15 minutes On air duration: typically <200mSEnvironment: Indoor only, rated IP40Temperature Range: -10 to +55ºC compliant to EN300 220-1, operational -30 to +60ºCHumidity: 95% non condensing (TMET PCB is conformal coated)Size: 120 x 120 x 55mm (excluding antenna)Weight: 560gConnection strip: Standard 5mm pitch rising cage connector (included)Antenna “TMET”: Supplied compressed spring, L=70mm, modified SMA base Gain -3dbAntenna connector: SMA socket is mounted on the TMETFixing: 4 x 4mm dia holes (fixing screws are NOT provided)Battery type: customised (7.2v) 2.3Ah Ni-mH with built in temperature sensorBattery endurance: typically > 5 days if battery fully charged and with Vaisala connectedCharging time: Using MP12U: typically 8 hours from discharged Using SPTMET typically from discharged 1 day of full sun.Max lead length to any connected sensor is 10M.

TMET

WXT520/WMT52

TMET to Vaisala connections

7-12VDC WXT520 Pyro TempSolarpanel

WMT52

+ + + RX TX + Inner

Screen

0 0 00

IN IN

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

OUT

RedBlue

Red

YellowGreen

Blu

e

Gre

en

Yello

w

TX RXDPage 10 of 16

Vaisala notes and configurationNote: The Vaisala device is set to take readings from the wind speed and wind direction sensors every 5 seconds to create a rolling average value for every 12 readings (1 minute). Therefore averaged values are sent at the time of a TMET transmission.

RH, temp, precipitation and barometric pressure are instantaneous values at the time of a TMET transmission.

Detailed setting information (if Vaisala software and USB configuration lead available):The configuration of the WXT520 or WMT52 can be checked using the Vaisala Configuration Software. " Connect the Vaisala device to the PC using the Vaisala USB configuration lead.

(Warning: Do not connect the Vaisala device to TMET and USB simultaneously!)" Launch the software.

For WXT520 and WMT52:" In File >Connection Setup, ensure the correct port is selected. To find the correct

port, open Control Panel > Device manager > Ports (COM & LPT) and note the COM Port number allocated to “Vaisala USB Instrument”.

" Check or change values to be as shown, ensuring the correct port allocation in Connect using drop down is selected. (allocation used is for illustration only):

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For WXT520: (For WMT52 go to page 14)

In Settings > Device Settings, set check boxes as below:

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In Settings > Message Settings, set check boxes as below:

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For WMT52:

In Vaisala Configuration Tool – No profile (Default Screen) adjust Averaging and 2 lots of Update interval as below:

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Message settings:

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Routine MaintenanceTMET: No routine maintenance required. Battery packs

should be replaced after 36 months.Vaisala WXT520 and WMT52: Vaisala (UK) advise there is no statement for

calibration period but suggest every year/18 months is best practice.

Vaisala (WXT520 only) offer test and replacement of the PTU (RH, temp and barometric pressure) with test report (no calibration). For costs refer Eltek or Vaisala direct.

Skye Instruments SKS1110: Skye Instruments recommend calibration every 2 years. For costs refer Eltek or Skye instruments direct.

Kipp and Zonen CMP3: Kipp and Zonen recommend calibration every 2 years. For costs refer Eltek or if in UK Equinox (UK distributor) direct.

Grant Instruments AG probe: None required, calibration every 2 years.Eltek probes e.g. type ELCM: None required, calibration every 2 years.

GuaranteeTMET and WBT are guaranteed for three years against faulty materials or workmanship. The guarantee given for equipment supplied by us, but not manufactured by Eltek (this includes all devices detailed in the “Sensors that can be used with TMET” is limited to the guarantee given by the manufacturer of the particular product as follows:

Vaisala WXT520 and WXT52: One year (extended warranty is available from Vaisala at time of purchase only)

Skye Instruments SKS1110: One year (extended warranty is available from Skye Instruments at time of purchase only)

Kipp and Zonen CMP3: Two years standardGrant Instruments AG probe: One yearEltek probes e.g. type ELCM: One yearGuarantee repairs to TMET or WBT are free of charge for labour, materials and return carriage.

Associated information available from Eltek:TN109 – GenII basic principles of operation.TN110 – Receiver/Logger Alarm management.

Page 16 of 16User Instructions TU1032 (10/04/17)